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[ey-teenth] /ˈeɪˈtinθ/

next after the seventeenth; being the ordinal number for 18.
being one of 18 equal parts.
an eighteenth part, especially of one (1/18).
the eighteenth member of a series.
(usually prenominal)


the fraction that is equal to one divided by 18 (1/18)

mid-13c., egtetenþe, modified, by influence of eighteen, from Old English eahtateoða; from eight + teoða “tenth” (see -ty (1)).


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